Raytek 3i Series – Non-Contact Infrared Thermometer


  • The most accurate readings in hot environments
  • The 3i thermometer compensates for the energy reflected by the background around the target
  • Reflected background energy compensation allows for accurate
    measurement even when the area measured is reflecting energy
    from nearby objects with higher temperatures; for example,
    inside a furnace.
  • Varying spectral responses, laser sighting systems, and distance to measurement spot ratios ensure the Raytek 3i temperature measurements are precise.

Raytek 3i Series of non-contact infrared thermometers is designed for advanced applications and processes that require specialized tools. These thermometers can measure surface temperature in locations where traditional thermometers are impractical. Offering various spectral responses, temperature ranges, laser sighting options, and onboard data logging capabilities, the Raytek 3i series caters to the specific needs of discerning users.


Model LT LR LRSCL2 1M 2M G5 P7
Temperature Range -30/1200ºC 600/3000ºC 200/1800ºC 150/1800ºC 10/800ºC
Accuracy ±1% of reading or ±1ºC (±1.5ºF) whichever is greater at 23ºC ±5ºC (73ºF ±9ºF) ambient operating temperature ±0.5% of reading or ±1ºC whichever  is greater at 23ºC ±5ºC ambient operating temperature ±1% of reading or ±1ºC whichever is greater at 23ºC ±5ºC ambient operating temperature
Repeatability ±0.5% of reading or ±1ºC, whichever is greater
Response Time (95%) 700 mSec 550 mSec 700 mSec
Spectral Response 8 to 14µm 1.0µm 1.6µm 5µm 7.9µm
Adjustable Emissivity (from 0.1 to 1.0 by 0.01)
Ambient Operating Temperature 0 to 50ºC
Relative Humidity 10 to 90%, noncondensing @ up to 30ºC
Storage Temperature -20 to 50ºC without batteries
Weight/Dimensions Laser Models: 208 H x 257 L x 71 W mm / 794 g
Scope Models: 244 H x 257 L x 71 W mm / 1000 g
Power 4 AA batteries or 6 to 9 V, 200 mA DC power supply
Battery Life (Alkaline) 21–25 hours
Laser Models with laser are IEC Class2/FDA Class II (<1mW)
Reflected Energy Compensation
Distance to Spot (D:S) 75:1 120:1 105:1 180:1 90:1 50:1 25:1
MAX, MIN, DIF, AVG Temperatures
Display Hold 7 Seconds
Backlit LCD
Temperature Display ºC or ºF (selectable), multifunction 4-digit backlit LCD
Display Resolution 1ºC or 1ºF
Locking Trigger
Tripod Mounting
Audible/Visible Hi/Lo Alarms
Analog Output 1mV/ºC 1mV/ºC 1mV/ºC
Digital Output RS232, 9600 baud, output interval adjustable from 1 to 9999 seconds
100 Point Data Logging
Options/ Accessories Nylon carry case with shoulder strap • NIST Certification (Must be specified at time of order) Variable brightness filters (scope and G5 only) • 110V/60Hz or 220V/50Hz voltage adapters Portable printer and cable • Computer, analog, and printer cables • DataTemp 2 software Hard shell case


Raytek 3i Series Non-Contact Infrared Thermometer-DpstarGroup